GetReversePostOrder(
      *graph_, &ordered_nodes_,
      [](const Node* n1, const Node* n2) { return n1->name() < n2->name(); });
  return absl::OkStatus();
}

Status CopyStackTraces(const Graph& from, Graph* to) {
  // Copy over the stack traces.
  // TODO(jpienaar): This really shouldn't be needed, copying the Graph above
  // and then needing these traversals is unfortunate.